Cohort progression — KS Korona 1919 Kraków
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 50 freestyle100 freestyle50 butterfly100 backstroke100 breaststroke50 backstroke200 medley50 breaststroke200 freestyle100 medley100 butterfly200 backstroke400 freestyle200 breaststroke200 butterfly800 freestyle400 medley1000 freestyle1500 freestyle
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2015 born 2014 born 2013